| 摘要 |
<p>The ventilator consists of a corrugated iron heat exchanger and has a connected blower for feed air and output air, and it is ready for plugging in. The appliance is flat, and may be hung on the wall of the room to be ventilated. The heat exchanger surfaces are black anodized. The ventilator has an integral time switch. The ventilation appts. may be operated on a timer. Fuel for room heating is saved by the heat exchange process which may use counterflow, with stale air leaving the room heating fresh air entering it.</p> |
